Rock-drill.



PATENTED NOV; 28, 1905.

001: DRILL.

APPLICATION FILED Nov. 21. 1904. RENEWED 0GT.19.1905. E

' 2 SHEETS-SHEET 1.

INVENTOI? Arromvm UNITED STATES GRANT SMITH, OF OTTUMWA, IOWA- Specification of Letters Patent.

ROCK-DRILL.

' IPatented Nov. 28, 1905.

Application filed November 21, 1904.; Renewed October 19,1905. Serial No. 283,499.

To all whom it may concern:

Be it known that I, GRANT W. SMITH, residing atOttumwa, in the county ofWapello and State of Iowa, have invented certain new and useful Improvements in Rock-Drills, of which the following is a specification.

My. invention relates to certain new and useful improvements in rock-drills; and it more particularly seeks to provide a telescopic air-hammer rock-drill of a very simple and durable construction whichwill readily and effectively serve its intended purposes.

4 Generically my invention comprises a'casing and a suitable support therefor, together with adrilling mechanism proper, which islongitu- ,dinally adjustable within said casing and which can be readily and quickly removed from the casing whenever it maybe found desirable to.

do so to replace the drill-tool orfor any other purpose. The casing is so arranged that. when the tool has been once adjusted the drilling mechanism can be readilyand bodily removed from the casing and-replaced therein without disturbing the adjustment of the apparatus, so that when the drilling mechanism is replaced the same is in exact alinement with the holder, thcreby'avoiding the necessity of readjusting the machine. ism propercomprises a tubular section including a pneumatic hammer operable therein and a supplemental tubular section forming an ex- .tension and joined to the end of the first tu.-'

bular section, and means for coupling the two sections together. comprises a plug carried by the second tubular section and which is internally threaded, a cap member for-the casing end to which it is detachably secured, a screw cooperating with the capmember and the internally-threaded plug, and means for turning said screw to move the drilling mechanism longitudinally within the casing.

With other objects in view, which will hereinafter be apparent, the invention includes certain novel construction and arrangementof parts, all of which will be first described in 1 detail and then be specifically pointed out in I the appended claims, reference beinghad to tudinal horizontal section thereof.

' ing in thedirection of the arrow a.

the accompanying drawings, in which- Figure 1 is a-perspective view showing my invention applied for use. Fig. 2 is a longi- Fig. 3 is a cross-section on the line 3 3 of Fig. 2 look- Fig. 4is a similar'view on the line 4 4 of Fig. 2 looking in the direction of the arrow 6. Fig. 5is

The drilling n1echan-' The adjusting mechanism a cross-section on the line 5 5 of Fig. 2 look- Figs. 6

ing .in'the direction of the arrow 0. and 7 'are similar views on the lines 6 6 and 7 7, respectively, of Fig. 2 looking in the direction of the arrows (Z and e. perspective view of the drilling mechanism proper removed from the shell or casing.

Referring now to the-accompanying drawings, in which like characters of reference indicate likeparts in all of the figures, l designates the casing or shell, which consists of a tubular section having one endl of a slightly- Fig. 8 is a reduced diameter, and the said casing has a r longitudinal slot 1 running from end to end, for a purpose presently explained. -The casing 1 passes through and is riveted to a base member 3', which comprises a casting including a base proper, 3, and acylindrical portion 3, through which the casing 1 passes and to which it is securely riveted by rivets {I}, as clearly shown in Fig. 5 of'the drawings. The base member 3 is so arranged and constructed as to be bolted to columns or drill tripods' in the usual manner. 3 designates a transin the casing 1. Y I

Fitted over the end 1 of the casing 1 is a cap 4; which is preferably formed of cast-steel or'o'ther hard material. This cap 4 is formed with a pair of lugs 4 4 and is slitted, as at 4", to form a clamp. The lugs-'4 4 are apertured to receive a clamping-bolt 5, by means of which the cap 4 is clamped to the casing 1. To prevent the casing end from"buckling when the cap is applied, and thereby closing the slotI", 1 provide the cap 4 with a lug 4" on its inner periphery, which fits into the slot 1" and prevents the slot from closing when the cap issecuredto the casing. The cap 4 is also formed with; a hub 4 centrally apertured, as at 4, to allow the passage of the 4 bearing portion 10 of the screw 10, which screw 10 is formed with a collar 10, which abuts. the inner face of the cap 4. The screw 10 is also provided ;with a squared end 10, to which the handle ll'is securely clamped by the bolt 11*, as shown. the collar 10"-to its free end is provided with a double thread 10 for a. purpose presently understood, and the said screw 10 projects into the casing l in the axial line thereof. ,f

. 6 designates a supplemental tubular section composed of apiece of extra strong pipe The screw 10 from whose end 6 is internally threaded to receive the threaded portion 9 of the closure-plug 9.

The plug 9 is provided; with an internallythreaded axle-bore 9 to cooperate with the threaded portion of the screw 10. At the other end the tubular section 6 is provided with a reduced end 6", externally closed at the extreme end by the web 6. The portion 6 is slitted, as at 6, so that it can be expanded for a purpose presently explained.

7 designates the shell of the hammer portion of the drilling mechanism, which shell 7 has its end 7 internally threaded, as at 7 to be screwed onto the reduced end 6 of the tubular section 6.

" 6", and thereby cause To tightly screw the sections 6 and 7 together and prevent them becoming unscrewed from one another and to fornn'as it were, a

single tubular member, I provide the ends 6*.

of the member 6 with an internally-tapered threaded aperture6 to receive a tapered screw wedge-plug 8', having a squared tool-re ceiving countersunk portion 8, whereby it can be screwed into place to expand the end it to tightly fit the shell end 7. v

The shell? is internally bored to receive a steel casting which forms aninner shell 12.

The said shell 12 has its outside surface turned off and is pressed into the shell 7. The inner shell 12 is provided with a plurality of circumferentially-internal grooves 12 12 12 12 which form chambers for purposes presently understood. The shell 12 between the grooves 12 12 is formed with a web 12 provided with an internal longitudinal bore 12 of less diameter than the main internal bore of the shell 12 to receive the valve 15 and form a bearing therefor. The valve 15 comprises a cylindrical body portion 15" of a diameter to pass through th bearing 'bore 12 of the web 12 and a head 15? of larger diameter tofit the shell 12. The valve 15 has an internal bore, as at 15, and provided with suitable apertures 15 in the head 15 and apertures 15 in the body portion 15. The-body portion 15"? at its free end is formed with a hardened head portion 15, which impacts the end of the tool T during the operation ofthe machine. The groove 12 forms the air-receiving chamber,

and the shells 7 and 12 have a communicating threaded bore 2 to receive the joint 2, to which joint 2 the air-supply pipe 2", havinga suitable cut-off valve 2, is secured. The

groove 12 forms the exhaust-receiving cham- 14 and projecting through the bore 14 to be impacted by the hammer portion 15.

The valve 15 reciprocates longitudinally withinthe inner shell 12 and automatically serves to cut off communication between the various chambers in the inner shell at various times to allow of'proper feeding of the working agent to the valve to cause the same to reciprocate in a manner clearly understood from the drawings. The inner end of the shell 12 is closed by a soft metal disk 13, as shown.

So far as described the manner in which my invention operates will be best explained as follows: After the drill is adjusted to operate upon the rock the parts are placed in the position shown in Figs. 1' and 2. As the rock isdrilled the operator moves the drilling-machineproper on its longitudinal axis through an arc of ninety degrees to give the proper twist to the drill, and this is done through the medium of the joint 2, which serves as a handle, as before mentioned. As the rock is cut away the drill is fed toward the same by simply turning the handle 11, which causes the drilling mechanism proper to be fed toward the rock and, longitudinally through the casing 1, it being understood that in practice the parts are so designed that a longitudinal movement of nine inches or more may be made without the necessity of changing to a longer drill. However, in practice I prefer to change drills at every six inches of thecut, and when it is desired to change the drills it is only necessary to unclamp the cap 4:, when the entire drilling mechanism may be withdrawn from the shell or casing 1 by simply pulling the same out through the end of greater diameter of the casing 1, it being understood that the joint 2 in this case passe'sthrough the longitudinal slot 1 of the casing 1 from the end of reduced diameter toward the end of greater diameter. As soon as the new drilLhas been adjustech into the hammer end of the drilling mechanism the same can be again'clipped into the casing 1 and the cap 4 applied, it being understood that when this is done the screw 10 is turned to bring the plug 9 close to the cap 4, so that the parts will be'in their position of less expansion.

From the foregoing it will be seen that I have provided a very simple and easy means whereby'the drill mechanismmay be removed from the work and from its casing and a new drill replaced and the drilling mechanism again put back in its casing without disturlr ing the adjustment of the machine as a whole, so that when the new drill is in position the same will be in direct alinement with the hole without the necessity of changing the adjustment of the casing, thus enabling me to cut a .hole in a more true and direct line than .has

heretofore been possible and without the necessity of adjusting the mechanism again into alinement with the hole.

' Any suitable hamtner-and-valve mechanism may be used in connection with my invention; but I; prefer to use the hammer-and-valve mechanism such as is disclosed in the accompanying dra'wings,as the same is gt a very simple and compact construction,

- thought the complete construction, operation, and many advantages of my invention will be From the foregoing description, taken in connection wlth accompanying draw1ngs-,'it. 1s

readily apparent to those skilled in the art to which it appertains, and I desire it understood that slight changes in the detailed construction, arrangement, dimension, and oper-- atioiiv of parts may be; made without depart-' ing from the scope of. my invention and w the,

appended claims.

Having thus described my invention, what I-claim, and desire to secure by Letters Patent, is-

1. A rock-drilling mechanism comprising a fixedly-heldcasing and a pneumatic hammer longitudinally adjustable" Within said casing and telescopically arranged with respect-to' the casing, means for adjusting said hammer Within said.casing,.means for detachably securing-the hammer gand hammer:- adjusting means'within the casing, said :hammer and said adjusting means. being bodily removable from the casing; i a

.2. A rock-drilling-mechanism comprisinga casing, a pneumatic hammer held within said casing, means operating with said hammer and casing to move said h'ammer'longitudinallywithin said casing, said hammer and said hammer-moving means being bodily removable from the casing... i

3. In an apparatus of the character stated, a base, a cylindrical casing fixedly secured to said base, a pneumatic hammer mechanism within said casing, a detachably-secured cap a for one end of said casing, means within said casing and connected with said hammer mech-' anism and said cap formovnig the hammer mechanism longitudinally within said casing,

said hammer mechanism, said hammer-mech anism-moving means and said cap being bodily removable from the casing. I

4. A rock-drilling mechanism comprising a plurality of telescopic sections, a' pneumatichammer mechanism carried by one of said sectlons, and means for extending and con- 5 tracting said telescopic sections, means for holding one section stationary, and means for detachably connecting said telescopic sections with each other to permit of the inner section being bodily removable from the outer section.

5. In a rock-drilling mechanism, a plurality of telescopic tubular sections, a base to'which the outer section issecured, a pneumatlc ham-. mermechamsm 1n the inner section, means connected with the outer and the inner tubular sections for extending and contracting the same, means for detachably securing the inner section and its parts within the casing, said inner section' -and its parts, being bodily removable from the outer section.

6'. In an apparatus of the character stated, a base, a tubular casing fixedly secured thereto, said base and said casing having a longitudinal slot, a detachably-secured closure-cap for one end of said casing, a pneumatic-hammer mechanism longitudinally adjustable within said casing,,said' hammer mechanism comprising a tubular'shellanda reciprocating valve having a hammer-head within said tubular shell,- a' coupling-joint, secured to the shell for coupling with the source of fluidsupply to admit the fluid into said shell to operate-said valve, said casing and said shell 'being telescopically arranged and said shell and its carried parts being bodily and end wise removablefrom the casing, the coupling-joint being slidable through said casing, abd base-- slots from end to end while the shell is being withdrawn from or entered into the casing" 4 substantially as shown and described.

, 7; In a mechanismofthe character stated,

a base, a tubular casing secured thereto, said tubular casing and said base having a longi: tudinal slot extending from nd'to-end thereof, ,a 1 pneumatic. hammer mechanism within said casing and comprising an outer'tubular shell telescopically held within said casing,

and'an inner shell tightly fitted within said outer shell, said inner shell having a plurality ciprocating valve within said inner shell,-said of internal grooves forming chambers, a revalve having a hammer-head, a drill-receiving bushing held in the. outer ends of the outerand inner shells,'a closure-disk for the other end of the inner shell, said outer shell having one end internally threaded, a supplemental tubular member havinga threaded end for engaging the threaded end of the outer shell to form'a continuation thereof, a screwplug in the opposite-end of the supplemental tudinal slot extending from end to end thereof, a pneumatic hammer mechanism within said casing andcomprising an outer tubular shell telescopically held Within said casing,

outershell, said inner shell having a plu rahty of internal grooves forming chambers, a reciprocating valve w1th1n said inner shell,

and an inner shell tightly fitted withinsaid said valve having ahammer-head, a drill-recei'ving bushing held in the outer ends of the outer and inner shells, a closure-disk for the other endof the inner shell, saidouter shell having one end internally threaded, Si supplemental tubular member havinga threaded end for engaging the threaded end of the outer shell to form acontinuation thereof, a screwplug'in the opposite end of the supplemental tubular sections, a cap detachably secured to one end of the casing, ascrew passing through the cap and the screw-plug for adjusting the hammer mechanism, a coupling-joint screwed to the outer shell and communicating with the interior of the inner shell for feeding the working agent into the said inner shell to 0perate the valve, ascrew-plug for the threaded end of the supplemental tubular section which engages the threaded end of the outer shell to extend said end to tightly fit said outer shell substantially as shown.

' 9. In a mechanism of the character stated, a base, a tubular casing secured thereto, said tubular casing and said base having a longitudinal slot extending from end to end thereof, a pneumatic hammer mechanism within said casing and comprising an outer tubular shell telescopically held within said casing, and an inner shell tightly fitted within said outer shell having a plurality of internal grooves forming chambers, a reciprocating valve within said inner shell, said valve having a hammer-head, a drill-receiving bushing.

held in the outer ends of the outer and inner shells, a ClOSUIGr'dlSlI for the other end of the inner shell, said outer shell having one end internally threaded, a supplemental tubular member having a threaded end for engaging the threaded end of the outershell to form a continuation thereof, a screw-plug'in the opposite end of the supplemental sections, a cap detachably secured to one end of the casing. ascrew passing through the cap and the screwplug for adjusting the hammer mechanism, a coupling-joint secured to the out-er shell and communicating with the interior of the inner shell for feeding the working agent into said inner shell to operate the valve, a screw plug for the threaded end of the supplemental tubular section which engages the threaded end of the outer shell to extend said end to tightly fit said outer shell end, all of the parts within the casing, and the cap, beihg bodilyre movable-from the casing, the coupling-joint passing through said longitudinal slot in the casing-base from end to end during the re moving operation, substantially as shown and for the purposes specified.

' GRAN" W, SMITH,

'Witnesses:

E. R. MITOHELI,

J. H. MITCHELL. 

